Statistical comparison of numbers of AREs among the different classes of genes. ANOVA test was applied to determine differences between occurrences of AREs in 3′UTRs of different classes’ genes: Early (E), Late (L) and Middle (M). Charts correspond to the type of ARE, A: class III, B: class I and C: class II. Early group genes always have significantly higher count of AREs than Late genes, and with growing complexity of AREs, Early genes also become more distant from Middle genes. Horizontal axis: count of ARE motifs found in gene groups. The circles denote mean value, the horizontal lines denote the confidence interval for mean value.